JP2001266761A - Color picture tube and tv picture apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem where a shadow mask is subjected to thermal expansion, when a color picture tube is operated, causing a whole frame to be moved to the direction of a tube axis, to generate shifting of an electron beam and decrease color purity due to mislanding. SOLUTION: A panel 11 and the frame 3 are held by a plurality of elastic supports 6, so that a screen 14 and the shadow mask 4 are opposed to each other. Each of the plurality of elastic supports 6 consists of a long-axis elastic support 6a, provided on a pair of long-axis supports 1 and a short-axis elastic support 6b provided on a pair of short-axis supports 2, with the short-axis elastic support 6b, having a spring constant smaller than the spring constant of the long-axis elastic support 6a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color picture tube used for a television, a computer display, and the like, and to a TV picture device having the color picture tube attached thereto.

[0002]

2. Description of the Related Art Generally, a color picture tube has a color selection electrode for color-selecting an electron beam emitted from an electron gun and a frame for holding the color selection electrode.

[0003] As a type of the color selection electrode structure, a flat plate member having a large number of openings such as rectangles, circles, and ellipses is pressed into a predetermined curved shape, and is formed by welding with a frame. 7a), a two-dimensional tension mask that is stretch-welded to a frame in a state where tension is applied in two-dimensional directions of a long axis and a short axis to a flat plate member having similar openings.
b) Also, a one-dimensional tension mask that is stretch-welded to a frame in a state where tension is applied to only one dimension in either the short axis or the long axis direction to a flat plate member having many similar openings (FIG. 7c) ) Or an aperture grill (refer to Japanese Patent Application Laid-Open No. 4-163830) in which tension is applied to a member made of a number of metal strips and stretch-welded to a frame.

Among them, those using a shadow mask are:
As shown in FIG. 8, a long-axis support 1 such as a steel material having an L-shaped cross section
A rectangular frame formed by bending a square steel material into a U-shape and welding it to the left and right ends of a long axis support 1 to form a rectangular shape; and a short axis provided with a plurality of electron beam passage holes. The shadow mask 4 is one-dimensionally stretched in the direction.
The elastic support mounting plate 5 is attached to the long-axis support 1, and the long-axis elastic support 6a is attached to the elastic support mounting plate 5.
Are welded so as to be parallel to the long axis support 1. Also,
The short axis support 2 is also provided with a short axis elastic support 6b.

FIG. 9 shows a front view and a plan view of a conventional elastic support member 6, which is fixed at a fixed portion 7 by an elastic support mounting plate 5 shown in FIG. A connecting portion 8 and a fitting portion 10 having a triangular pin engaging hole 9 formed at the end of the connecting portion 8 are formed on the panel 11 as shown in FIG. It is fixed by engaging with pins 12 erected on the inner surface of the side wall.

At this time, since the frame 3 stretches and holds the shadow mask 4, a large tension acts. For this reason, as shown in FIG. 10, when the long axis direction of the frame is the X direction, the short axis direction of the frame is the Y direction, and the tube axis direction of the CRT is the Z direction, the long axis support 1 of the frame 3 is deformed in the Y direction. At the same time, it is deformed in the + Z direction,
Is deformed in the X direction and simultaneously in the -Z direction. In such a state, when the color picture tube is installed in a TV set and operated, the shadow mask 4 is irradiated with an electron beam to about 50 to 50 mm.
100 ° C. temperature rises.

[0007]

When this color picture tube is operated, the shadow mask expands due to thermal expansion. For this reason, the deformation of the frame which has the shadow mask stretched and held is also reduced. At this time, since the frame is engaged and fixed via the pin, the position of the pin does not move, and as a result, the entire frame moves in the -Z direction. As a result, there is a problem that the electron beam moves and the color purity is reduced due to mislanding.

An object of the present invention is to provide a color picture tube which has solved the above-mentioned problems. Even when the color picture tube is operated, the amount of mislanding caused by the movement of the frame position is reduced, and the color purity is improved. The purpose is to obtain a structure that suppresses the reduction.

[0009]

In order to achieve this object, a color picture tube and a TV picture receiving device according to the present invention comprise a panel having an effective portion having a screen formed on the inner surface and a side wall around the effective portion. Part, a frame composed of a pair of long shaft supports opposed to each other and a pair of short shaft supports provided between the pair of long shaft supports, and a frame in which a tensile force is applied in one direction. In a color picture tube having a shadow mask stretched and held on a frame, the panel and the frame are held by a plurality of elastic supports so that the screen and the shadow mask face each other. The support comprises a long-axis elastic support provided on the pair of long-axis supports and a short-axis elastic support provided on the pair of short-axis supports. The spring constant of the body is Is obtained by configured to be smaller than the spring constant of the serial long axis elastic support.

With this configuration, when the deformation of the frame during the operation of the color picture tube is alleviated, the frame is balanced at a position close to the pin position on the long axis support side, and the amount of movement of the frame is reduced. As a result, the amount of mislanding during operation of the color picture tube is reduced, and a decrease in color purity can be suppressed.

Similarly, when a TV picture apparatus incorporating this color picture tube is operated, a high quality image with high color purity and no mislanding can be obtained.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings.

FIG. 1 is a partial sectional view of a color picture tube according to a first embodiment of the present invention. As shown in FIG. 1, the color picture tube includes a panel 11 having a phosphor screen 14 formed on an inner surface thereof. , A funnel 15 connected to the back of the panel 11
Constitutes an envelope with the neck portion 15a of the funnel 15.
Has a built-in electron gun 17 for emitting an electron beam 16, and a deflection yoke 18 for deflecting the electron beam 16 is mounted on the outer peripheral surface of the funnel 15. Panel 1
The phosphor screen 1 is coated with phosphor dots of three colors on its inner surface, thereby forming a phosphor screen 14, and a flat plate-shaped shadow mask 4 is disposed substantially parallel to the phosphor screen 14. The shadow mask 4 is formed by performing an etching process on a flat plate, has a large number of regularly arranged openings, and plays a role of color selection for three electron beams 16 emitted from an electron gun 17. The shadow mask structure 19 is held by the frame 3. Shadow mask structure 19
Is locked in the envelope by fitting an elastic support 6 attached to the frame 3 and a pin 12 provided on the panel 11. The structure of the frame 3 is the same as the conventional one. As shown in FIG. 8, the elastic support 6 is provided on the long-axis elastic support 6 a provided on the long-axis support 1 and on the short-axis support 2. And a short axis elastic support 6b,
The spring constant of the short axis elastic support 6b is smaller than the spring constant of the long axis elastic support 6a.

Further, since the shadow mask 4 is stretched and held on the frame 3, a great span tension acts on the frame 3. For this reason, the frame 3 is deformed as shown in FIG. That is, the long-axis support 1 is deformed so that the center becomes convex toward the inside of the frame 3 and at the same time, is deformed so that the center becomes convex in the + Z direction. Further, the short-axis support 2 is deformed so that the center becomes convex toward the outside of the frame 3 and at the same time, is deformed so that the center becomes convex in the −Z direction. Meanwhile, frame 3
Is connected to the panel 11 via the elastic support 6 as shown in FIG.
The shadow mask 4 is heated by the electron beam and thermally expanded during the operation of the color picture tube, so that the tension is reduced. Therefore, the deformation of the frame 3 due to the tension is small, but the elastic support 6 is deformed because one end of the elastic support 6 is locked by the pin 12. That is, the portion where the long-axis elastic support 6a shown in FIG. 8 is attached to the long-axis support 1 moves in the −Z direction, and the portion where the short-axis elastic support 6b is attached to the short-axis support 2. Moves in the + Z direction. Shadow mask 4
Is stretched and held on the long-axis support 1, so that when the long-axis support 1 moves, the shadow mask 4 also moves at the same time.

In the construction of the present invention, the short axis elastic support 6b
Is smaller than the spring constant of the long-axis elastic support 6a, the deformation of the long-axis elastic support 6a is smaller than the deformation of the short-axis elastic support 6b. Becomes smaller. That is, when the deformation of the frame during the operation of the color picture tube is alleviated, the frame 3 is balanced at a position close to the pin position on the long axis support side, and the amount of movement of the frame 3 is reduced. As a result, the amount of mislanding during the operation of the color picture tube is reduced, and the effect of suppressing a decrease in color purity can be obtained.

At this time, by making the spring constants of the opposing elastic supports 6 equal, it is possible to obtain an effect that the balance when engaged is further improved.

Here, when the spring constant of the short-axis elastic support 6b is larger than 1/3 of the spring constant of the long-axis elastic support 6a, the amount of movement of the frame 3 during the operation of the color picture tube is sufficient. When it is smaller than 1/10, it is difficult to hold the frame 3 at a predetermined position. Therefore, the spring constant of the short axis elastic support 6b is
It is desirable that the spring constant of the long axis elastic support 6a is 1/10 to 1/3.

FIG. 3 is a front view and a plan view of the elastic support of the color picture tube according to the first embodiment of the present invention. As shown in FIG. 0.8m
m, the working length L, which is the distance from the pin engagement hole 9 to the nearest welded and fixed portion, is 65 mm, the plate thickness t of the long axis elastic support 6a is 1.2 mm, and the working length L is 58m
m. Thus, the spring constant of the short-axis elastic support 6b is 1/6 of the spring constant of the long-axis elastic support 6a. At this time, the amount of displacement of the frame when the color picture tube is actuated is reduced to 1/4 compared to when the spring constant of the short axis elastic support 6b and the long axis elastic support 6a is the same. I have. As a result, the amount of mislanding in the color picture tube is reduced, and a structure that suppresses a decrease in color purity can be obtained.

In this embodiment, the elastic support 6a for the long axis and the elastic support 6b for the short axis are different in both the plate thickness t and the working length L. A predetermined spring constant may be obtained by making only L different.

FIG. 4 is a front view and a plan view of an elastic support for a color picture tube according to a second embodiment of the present invention. As shown in FIG. In order to make the spring constant smaller than that of the elastic support 6a,
Is installed. According to the present invention, it is not necessary to make the plate thickness of the short axis elastic support 6b smaller than the plate thickness of the long axis elastic support 6a, and it is possible to prevent the strength of the short axis elastic support 6b from decreasing. can do.

FIG. 5 is a front view and a plan view of an elastic support of a color picture tube according to a third embodiment of the present invention.
As shown in (1), by providing a bent portion 21 on the elastic support 6 and controlling the spring constant by the curvature of the bent portion 21, the spring constant of the short-axis elastic support 6b is changed to the long-axis elastic support 6a.
Smaller. Specifically, by increasing the curvature of the bent portion 21, the spring constant can be reduced.

FIG. 6 shows a TV image receiving apparatus using the shadow mask of the above embodiment.
Is a color picture tube 13 for displaying images inside a housing 23.
And a control circuit 24 for controlling the operation of the color picture tube 13. Out of the housing 23, the color picture tube 13
A protective glass 25 is attached at a position corresponding to the front surface of the.

[0023]

As described above, according to the present invention,
An effective portion having a screen formed on an inner surface thereof, a panel portion having a side wall around the effective portion, a pair of long axis supports opposed to each other, and a pair of long axis supports provided between the pair of long axis supports. In a color picture tube including a frame composed of a short-axis support and a shadow mask stretched and held on the frame in a state where a tensile force is applied in one direction, the screen and the shadow mask face each other. The panel and the frame are held by a plurality of elastic supports, and the plurality of elastic supports are a long-axis elastic support provided on the pair of long-axis supports, and the pair of short axes. A short-axis elastic support provided on the support, wherein the spring constant of the short-axis elastic support is smaller than the spring constant of the long-axis elastic support. Frame deformation When that occurs, the frame will be balanced at a position near the pin position of the long axis support side, the amount of movement of the frame is reduced. As a result, the amount of mislanding during the operation of the color picture tube is reduced, and a decrease in color purity can be suppressed.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of a color picture tube according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating deformation of a frame due to stretching.

FIG. 3 is a front view and a plan view of an elastic support of the color picture tube according to the first embodiment of the present invention.

FIG. 4 is a front view and a plan view of an elastic support of a color picture tube according to a second embodiment of the present invention.

FIG. 5 is a front view and a plan view of an elastic support of a color picture tube according to a third embodiment of the present invention.

FIG. 6 is a schematic structural diagram of a TV image receiving apparatus.

FIG. 7 is a perspective view showing types of conventional color selection electrodes.

FIG. 8 is a perspective view showing a frame structure of a shadow mask.

FIG. 9 is a front view and a plan view of a conventional elastic support of a color picture tube.

FIG. 10 is an assembly view of a conventional color picture tube.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Long axis support 2 Short axis support 3 Frame 4 Shadow mask 6 Elastic support 7 Fixed part 8 Connecting part 10 Fitting part 11 Panel 13 Color picture tube 14 Phosphor screen 20 Hole 21 Bend part 22 TV image receiving device 23 Case Body 24 control circuit

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hideo Kurokawa 1006 Kadoma Kadoma, Kadoma City, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. F-term (reference) 5C031 BB05 BB08

Claims (9)

[Claims] 1. An effective portion having a phosphor screen formed on an inner surface thereof, a panel portion having a side wall around the effective portion, a pair of long axis supports facing each other, and the pair of long axis supports. A color picture tube including a frame including a pair of short axis supports provided therebetween, and a shadow mask stretched and held on the frame in a state where a tensile force is applied in one direction; The panel and the frame are held by a plurality of elastic supports so that the and the shadow mask face each other, and the plurality of elastic supports are
A long axis elastic support provided on the pair of long axis supports, and a short axis elastic support provided on the pair of short axis supports; and a spring constant of the short axis elastic support. Is a color picture tube having a spring constant smaller than that of the elastic support for the long axis. 2. The elastic support for a long axis and the elastic support for a short axis are provided in a pair at opposing positions, and the opposing elastic supports have the same spring constant. A color picture tube as described. 3. The spring constant of the elastic support for the short axis is 1/10 to 1/3 of the spring constant of the elastic support for the long axis. 2. The color picture tube according to 1. 4. The elastic support according to claim 1, wherein the elastic support comprises a fixing portion fixed to the frame, and a fitting portion fitted to a panel pin provided on an inner surface of the panel side wall. 3. The color picture tube according to any one of 3. 5. The elastic support for a long axis and the elastic support for a short axis have different thicknesses.
5. The color picture tube according to any one of 4. 6. The elastic support for a long axis and the elastic support for a short axis have different distances from the fitting portion to the fixing portion. A color picture tube as described. 7. The color picture tube according to claim 1, wherein a hole different from the fitting portion is provided in the elastic support. 8. The elastic support has a connecting portion for connecting the fitting portion and the fixed portion, and the long-axis elastic support and the short-axis elastic support are connected to each other. The color picture tube according to any one of claims 1 to 6, wherein the curvatures of the bent portions provided on the color picture tube are different. 9. A TV picture receiving device comprising a control circuit for controlling a color picture tube, and a housing for accommodating the control circuit and the color picture tube, wherein the color picture tube is provided. A TV picture receiving device, characterized in that it is the color picture tube according to any one of the above.